Updated SQS requirments file (#4231)

docs/getting-started/brokers/sqs.rst

@@ -14,7 +14,7 @@ library using :command:`pip`:
 
 .. code-block:: console
 
-    $ pip install -U boto
+    $ pip install -U boto3
 
 .. _broker-sqs-configuration:
 

requirements/extras/sqs.txt

@@ -1,2 +1,2 @@
-boto>=2.13.3
+boto3>=1.4.6
 pycurl